Oh how I feel your pain. I have learned to keep all fabrics AND the UFO together until it is finally finished. Of course all bets are off if one of those fabrics happens to be JUST PERFECT for your current project! Walk away and have a cup of coffee. Who knows, that binding might just jump out at you when you come back into your sewing room. (Or you could look upon this as a 'necessary opportunity' to add to your stash.)